PS5 will have 6-7 times or more GPU raw power than PS4... and near 10x more CPU raw power (the biggest difference) over PS4.
That is indeed a big jump.
Exclusives games will be based on PS5 hardware like exclusive today based on PS4 hardware (not Pro).
Pro is a second profile not optimized at hardware level... I mean you optimize to the PS4 hardware and after that you up the software settings to reach a good result on Pro.
The games are still based/optimized for PS4 hardware and you will never see a hardware optimized game for PS4 Pro or XB1 X and that is why devs can't use Pro/X fully potential.
Wouldn't game engines that fully use XB1 X and PS4 Pro Polaris features lag behind the hardware being released? If you start with the premise that AMD wanted Game Consoles to use AMD hardware which forces game engines to actually use (to the Metal) the hardware to it's best advantage AND both the XB1 and PS4 Pro are using many Polaris features in those newer more powerful GPUs, it's likely that developers will create game engines that support Polaris features and at the same time support the original 2013 consoles. Further, PCs benefit from games developed for consoles and developers don't have to reinvent the wheel.
Sony being intensely involved in AMD's Navi design can be about the above and iterative consoles and/or Sony has plans to also jump into supporting the PC. Sony does have a UHD BDA licence for the PC player and drive which they have not used yet. I've seen several people mention TV Set Top boxes moving to X-86, the original Google/Android TV box was Intel Atom X-86 and AMD APUs are getting very power efficient.
Iterative PS4 and XB1 hardware gets another confirmation in the efficientgaming.eu SRI where it says that post 2019 or after the next console, resolution can't be used to define new consoles and some other method will have to be developed. This means AI, Draw distances, FPS etc. change with more powerful consoles but not resolution. This also seems to indicate the 8K and Game Consoles mentioned in Samsung's GDDDR6 memory slide is about 4K 3D/VR not 8K resolution games.